Study On Effect Of Environmental Factors On Disease Of Walnut Leaf Scorch In Xinjiang Shajingzi

Walnut planting industry is an important pillar of economic development of the Xinjiang Shajingzi region.In recent years,the widespread occurrence of walnut yellow leaves and showing a growing trend.In order to reduce the losses caused by the yellow leaves,The experiment was conducted in different walnut orchards by 185 walnut trees with different tree age and tree type were used as test materials,Study on the influencing factors of the occurrence of leaves dry rot and effects of different control methods on Walnut Fruit Quality.The main results are as follows:(1)The dynamic law of walnut leaf scorch time is : walnut leaf scorch started from the onset of June,The average incidence rate was 20.97% and the disease index was about 6.63;August reached the peak incidence,the average incidence was 94.96%,the disease index was 82.94;In September,the incidence of new leaf was decreased to 82.95%,and the disease index was 49.48.(2)The spatial dynamic rule of walnut leaf scorch is:In the vertical direction of the walnut canopy,the disease index of 6-8 month is the upper part of the lower part,September,due to the upper part of the new leaf disease index for the central part of the lower,The disease index in the horizontal direction is peripheral > Central > inner bore,The disease index in different directions is to the South and east to West.(3)The factor of different environment and walnut leaf scorch multivariate regression analysis shows that the influence degree of walnut leaf scorch disease index is as follows: the light intensity,water salinity,relative humidity,soil moisture and temperature.(4)Light intensity and leaf scorch were positively correlated,i.e.with the stronger light walnut leaf scorch disease severity;and the correlation between temperature and leaf scorch disease severity is very small;a significant negative correlation between disease index and relative humidity field,With the relative humidity in the field more walnut leaf scorch disease index is low;between the soil moisture and the disease index was negatively correlated with soil moisture,the greater the lower the degree of disease of walnut leaf scorch.(5)The study shows the relation between water salinity,soil nutrient,soil salinity and walnut leaf scorch: there was a positive correlation between water salinity and disease index,water salinity is high,the more serious the degree of incidence of walnut leaf scorch.Low salt water canal(conductivity is 0.76)low disease index of irrigation was 47.72 and 48.73 incidence of walnut,with high salt content of groundwater(conductivity is 2.07)and water(2.86 gap conductance)irrigation and the severity of disease,the disease index was 49.74 and 53.34;negative correlation the relationship between disease index and content of available potassium in soil and organic matter,potassium and organic matter content is higher the lower the disease index and disease index;positive correlation between soil salinity,soil salinity is higher,the higher the leaf scorch disease index of walnut.(6)According to the environmental factors on the impact of walnut coke disease analysis of the main reason for the occurrence of walnut leaf disease is the leaf physiological dehydration.On the one hand is due to the transpiration of the tree is greater than the water absorption capacity,The effect of high light intensity,hot air,low soil moisture content and low groundwater level in June-August exacerbated the occurrence of the disease.On the other hand,the salt content of the soil and the high salinity of theirrigation water lead to the osmotic pressure of the plant,the difficulty of water absorption,and the destruction of the normal metabolic process.(6)Island,borax,potassium sulfate has control effect of different degree of walnut leaf scorch disease.In different concentrations,the island 1000 times liquid hormone treatment efficacy(the best control effect was 13.51%),borax 1500 times liquid(Na2B4O710H2O)with the best control effect(the control effect was 7.81%).The control effect of 1000 times liquid K2SO4 solution(the best control effect was 6.78%).